bugid-86845: For some reason, removing this animation allows the event f...

...ire to happen

https://wikia.fogbugz.com/default.asp?86845
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I don't understand why, but the textarea still animates its height when this animation is removed. The code in the animation callback wasn't being run, so the "editorAfterActivated" event wasn't firing and the buttons weren't becoming enabled. 

Hoping for a review from Kyle Florence as he probably knows more about this code than I do.